package com.zhangxi.interceptor;

import com.zhangxi.constant.JwtClaimsConstant;
import com.zhangxi.context.BaseContext;
import com.zhangxi.properties.JwtProperties;
import com.zhangxi.util.JwtUtils;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @author zhangxi
 * @create 2024-04-18 10:49
 */
@Component
@Slf4j
public class JwtTokenAdminInterceptor implements HandlerInterceptor {

    @Autowired
    private JwtProperties jwtProperties;

    /**
     * 校验JWT
     * @param request
     * @param response
     * @param handler
     * @return
     * @throws Exception
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //判断当前拦截到的是Controller的方法还是其他资源
        if (!(handler instanceof HandlerMethod)){
            //当前拦截到的不是动态方法，直接放行
            return true;
        }
        //1、从请求头中获取令牌
        String token = request.getHeader(jwtProperties.getAdminTokenName());
        //2、校验令牌
        try {
            log.info("jwt校验：{}",token);
            //使用JwtUtils工具类中的解析JWT方法解析token
            Claims claims = JwtUtils.parseJWT(jwtProperties.getAdminSecretKey(),token);
            //获取Claims中保存的信息
            Long empId = Long.valueOf(claims.get(JwtClaimsConstant.EMP_ID).toString());
            log.info("当前员工id：{}",empId);
            //将用户id放到ThreadLocal中
            BaseContext.setCurrentId(empId);
            //放行通过
            return true;
        }catch (Exception e){
            //不放行，不通过，响应401
            response.setStatus(401);
            return false;
        }
    }
}
